My '02 Impala LS has started running rough every so often (twice now) right
after startup. It feels like a miss. The check engine message doesn't come
I also noticed a grainy deposit inside my oil cap, kind of like oily sand.
But, the "grains" are softer and if you rub them between your fingers they
smooth out into kind of a paste. The color is dark brown/black.
I have been keeping an eye on my coolant level (wary of the leaking manifold
gasket problem) and it looks ok. The last oil change was a month or so ago
with whatever stuff the local dealership uses.
Any ideas out there? Thanks.
It doesn't look like that (no yellowish gunk), and I don't see any evidence
of coolant on the dipstick. I noticed this deposit just recently, and it is
coincidental with a dealer oil change a couple months ago (I usually do oil
myself and use Mobil1, but they changed it for me without my asking them to
the last time I had it in).
I've never noticed any kind of deposits on any of my vehicles when using
Mobil 1, so I might just change it again ahead of time and see if it goes
Thanks for the tip, though - the whole reason I even look at the cap
periodically is to check for the "gunk of death".
I would certainly take a sample of engine oil and send it in for analysis to
make sure that the dreaded intake manifold leak isn't happening.
They will send you the sampling kits for free.
Cost for the oil analysis is $20 for the basic analysis, or $35 for analysis
plus expert interpretation by Terry Dyson.
It is well worth it to check up on these engines.
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